You can use PCAccess to connect S7-1200. But only data in DB1 will be available. How to read/write the data with VB, you can see in the example of PCAccess Help. You can also look for examples with OPC and Visual Basic. PCAccess is using OPC.

Thanks for the suggestion. But this stage is OK in our case. I am able to see all the tags (that we want) from PLC to PC Access...

The matter is to use these data in Visual Basic while PC Access running on back. We do not know the commands to use this data in VB. If we can see a sample program or any routine to use them everything will be good.

did you try the Visual Basic sample program included on the PC Access software? The OPC PC Access software works fine when I define the IP address with TSAP Local to 10.00 and Remote to 03.01 (or 3.00). Inside of it I created 2 byte variables in a DB1, that I access with the names VB0, and VB1. In the VB application I include to items:

After that I "Add Item" and try to "Read Asyncron", but the Read value in both items turns in Red and appears "BAD". After making the connection I see the icon of the OPC Server on the PC, so I think the problem is related with the format of the items. I don't know what is the meening of the definitionof the items. It could help understand the sample program.